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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0002c8f9ecd97f6fd3bff01e21b9eef1f902fcd4d5785a25a47fa8bf8e6d86f' 
  AND token = 'K92Jm8uSeU6Ov/b2GPMHmRxvUjMuu3tDnM3RtFBqeGA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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