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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9e7682d9c9ee92166dbf9c6d9b1746d7567e0f0f0857823bdf8b75c7e266add' 
  AND token = 'aJ1qRBNai+TfzR5j3O68q5r/CaG0FaHjFjxpP5k1Fxg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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