SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '43b6222c7ae198a29b6a4af716ed0ec1528863db19f43b1d856e5e1005d23312' 
  AND token = 'OU8lGzTz3puj3PN5B4Ov4lIpXKmuHRLVq+POLBwMu4g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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