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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '984b1626747d31c3ec0d5652bce62950c387c7c9cd3738947a2ca9db62b6eead' 
  AND token = 'E7I9UF+1STwI4q26q93FKqnybXFis8EtjmJGjM0T8Yg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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