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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cefd90bc9f93d9e50845d9a18b361b6d75c712d47ff5f4f4333a7eec7a2efa3c' 
  AND token = 'z9RzRPShaS7yExOQhuW4D9FLejeAzDM7C/BJRd/2idc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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