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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9926b8ad20abef6f38aab90a7a10404c50f718ed1c5aadca3cbb0ea273a5781' 
  AND token = 'SJExvdmouU1LDHmodjYViR4gbrFSTlgnQMakc7fkd+o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00144

JSON explain

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