Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0cf3ab7187a27652f03b0f3588ffeea0599a0d8451ebb5be1e4b078ef619f522' 
  AND token = 'tR2xA3FPDksklM4ccDueKAzBkfFxXz+pBgC3x812+Q4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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