SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a267b21a4c434fe76398a2c799d8a457dc97d9971eecb651f1fc32bedf4be749' 
  AND token = 'zW6ZiZC4Z/Ljz/k/OEIpar+3P4qg/P6VuxpvFN0vDYs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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