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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab89f5b3900e8a625f9110d986b52f81af4764b03f7141455f80f9c16a3b4116' 
  AND token = 'W8JZWCUareAcubMnUsx4kAfRAbABL+2wpAl6f/vq8c0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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