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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a2e03fb122f4241e9c79935b914d17bf6cafcfe1a424d19da8d68008bfe3b5c' 
  AND token = 'rQy3/EpVVDtYlQhgN4eT8dl8WaTe8OJ1IOQtuHSXayY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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