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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df87d4badcfb3b37a8daebb7c4ac9b862aba9cf24d183ceacebe972716553646' 
  AND token = '230tAEZ6QkRFwU3s1LMht5YTds+zy/j8KLXKQz0LdxY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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