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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '81f29a2380e86bc4db8fc80e2cdf4fc63f66ce0209655864a9dfcf1ff6bb26b0' 
  AND token = '40ZhdHkWRHlL7IShs4kgQxq8SXCUgGryxWhBda5KurA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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