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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15c0d225b3bc9c2b34d554a380220898932b311fafbe7745446a68213639a11d' 
  AND token = 'z4+pFxtJ4glysB9NJh6bi9YuY2ZtdkxUEWCrQ82GQ2k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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