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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82735d4c9db1a09166a939df0deecce6d874a6911569fb8fb7bda6342c42a709' 
  AND token = '+NGgT4gwDjgryxSMzECjVuA8wuAXg8kySnz9v33DG9o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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