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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e60c25e67c20473b04a00d8822ccce3097469f729c6f0d8ec3f50fa35015b64d' 
  AND token = 'yobt8BkTjq7N/gttwWhEXyQQlvO61rDYujn5AIih7L8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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