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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a24b8c3d8030515577a8eca22d5cb44c7e1478257bc08a6070502d198150a85a' 
  AND token = 'e898JM+CwHymBwXH0mDrvukFNDOYo47iUghE3+jO7uE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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