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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a6aa9ea41d13d7a2add44ba9d314b416a441f4cc3b79078d1fc12ebbd66450e' 
  AND token = 'FEOPYrD8MAsoKsX5GLI7ZeKgzsGycew3DDiL1UKk9QY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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