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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24eea3caf8b3a8c30d1251eb3d112bd8b1b0bc40b3239ca51f591e93343b968f' 
  AND token = 'NnhlwLZzJ8D8ka4TlsCZL6ZmPEu6qZ/RgORVfHkpUgo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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