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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79dd9c24bee8e2834d55f8992aa1db9471e9f11c8b5a6e8525392eea0cd68927' 
  AND token = 'LXlkvt5lxD3AhfQO1AgqDs3eIkLmmTWzGUgclshECuM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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