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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '65e6ae5819294322b76ac6ce4cb4b7c161532ff1ab1e7462255bf4887eb2b69a' 
  AND token = 'adne6ESmaM2AJNv9Lkbi5egin5yIp2iq3/1gjrkXXKY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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