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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8063cbfa9e04ce286a3627d735d7502eb7d4647b0604a64b96f8177a473cf2e1' 
  AND token = 'QptgCsj/eZi9GVsSiJn/GYGx2VCk3M9t6ATae91wrp0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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