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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8f5d6d9ef14683daafdca850f16e95e2893d1a06178345b416552fa244b573e' 
  AND token = '1vgx9iWiDfE93x0YfK8kvW5bO97s7XrYjlg9Diov37U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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