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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ee0c95fce8fc03ee76e26d06ad72f5b85f1cf180682f80d0c869ed6f2d83482' 
  AND token = 'am2uvdQoRO7ezh8WoXwjKe//IRFYxNjznh/2LPYWCpo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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