SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed95422b05025f4f188695c05345ce63847277a3a3f610ac3cc1a3546f5b758a' 
  AND token = 'VHZfBY9JTwlEZphF1ACL8CImTTvUNEun6EfKFUa6G24=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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