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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9329930b6989b2541afa705f8da3837b153ba7f55a9c34bf6203f11d3adca388' 
  AND token = '1fDs4QPVX6tKVE5Y2k3bYQmYSvpAy+bqbEQrva2zRQI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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