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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9a7ec69135905cba161ffee414fedd5f11a1e92f79e79d90b43bba12c84e66c' 
  AND token = '3eVCs/F/RXiD9KJo5dGD134zVRNFvkaLuapuAYbpoeU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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