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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aef896ac634220671ee86b7a63a9dfc7d5e7458f9e6fd875c3899422fac7b720' 
  AND token = 'BLSOO9eJRk5F2zIs+Q1i7HhHk0/vLGSPtYFpmEkpfIc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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