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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac923a3314b4718e30cb6ff3428658c6bf2c17a37989f21c3493a978aa3d68d7' 
  AND token = '0H20LEJiWngHjPawHjmfT9F8SPOkTg/sJsew3i41V9E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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