SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '80ccf7aa0a6b569bf6369ef718f6f2223a783c5df397434cb3b61ac216554fcf' 
  AND token = 'YhKHchch/3p4SH8WmFU7tZggfC9xyuHIWsLqGYD4I1Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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