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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca0145ddde8412311eda7176c7b1a468697ecf77ff3d6a6eadd19b13d2504e4b' 
  AND token = 'WcnMwDKBnf4gEA6dyrykiFd3ISHv6HW0aiJyRX4QFBY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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