SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5999748cd9721bb24d32e5a2102f894f07e52c26c0e74f507a1ef160840ed3e' 
  AND token = 'vAQTj7l246ilSzBBTm/CQG2nKq5DxHGQwxVj+rznIpY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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