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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '593885a8f3e0d6e3c6fd0c99104bf8eb4f5a1b72ae408093d3b1bba9cf9dbd68' 
  AND token = 'AWMU32SHq+Ecsx6ynKlZdRbXjpmBMrTMOqLW+FuK3D8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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