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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa38b99ccec6cc1e8b86354e721a40e7af19c9f9dda60c6e86b896a41ed6cb61' 
  AND token = 'b9cAFJCShN5LqYzNFjMYq9ZsoOlUDv8n5ANCiColnuw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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