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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4e8ebd986ce28e773fd439d4f625f4fae148085f3feea9144940ee1af59e261' 
  AND token = 'o8DsNkH8Pu8hP7gLYNT9U3nEtIaTQkHajG33A/9cO5k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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