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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9dfc243af61b2f3cbacc6d5fff787803aaa23876e5a441d87441d0fafb504ed0' 
  AND token = 'N9db8H6tmROJW4142rzudUXc56jjEfZt4JdCZDuN0jw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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