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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '25c11b57a815f9ef403e2b16c5c1bba2105145ecc1acd92238efdc85a59b4aa6' 
  AND token = 'kTU6r0kXIeHf/0QWpX8Jxoyoy25sZ/AEX+sbJf+Q+PM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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