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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c481ebebf94e71edf743a8fc3bea88443604e08667bee987c0418b16b5b04369' 
  AND token = 'rpu3WZvO7Gi+M3jTbFkQbtJ6WKe6qqSFH1HAXIPuhIg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00062

JSON explain

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