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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '116cc4bbde67e498fcade3b74d62ae4eece9adbae75bf5a4fa931eb2cd802aed' 
  AND token = 'itmTKKYeE2fQMBeWxOUR9L26e8P2WzNdL9wtJ9Wkx1I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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