SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61f06fa4edf7be2fd26860e3ef05c1a35d32190b66401a27b48c39a9b46d99e6' 
  AND token = 'KHJ1MIarh7JF4gW1yzOW7HSejZ4NP/LFbEGL/j0+w1g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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