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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa7cd8dde3cefca52790443dec9c5cd440f8d7bb48e8ad1b3820afdd9560f7ab' 
  AND token = '+S5vEi0P/BhWaFblSS7Rtxp3ngkM/lCuUoVLhve1d+8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}