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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e8c58952e61e5ed76c6044b24b57dd6008431679e7c15a81d0a94d26d85f50e' 
  AND token = '/rde0VCi9Hy8pXtEDzq9raypWNjLsbNyrBt3sZNkE+c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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