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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c08abc86c60b2d9a166603d86e8fc3eaecfc99d8690c4e01c43c51736fd3c3ab' 
  AND token = '9Lf7YVa0vzrMEEhe5sVLM0EqQryhEPNOB+iYV98wz3Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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