SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0293cd8a899c86f05e73514330fdcaea10917cc6ad0133ca577d02fe481c620f' 
  AND token = 'wGuWzFfv/3Fh0lqmeYXQTiJjcbW2i7Bu0b+Z5Dml3qI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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