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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4ab97593678d3b5d0a840d6554e4fb9e59bc634186a5fe4fcf0cd54d8bbc452' 
  AND token = '2vh1N7giiuCg0DajTf0NPY9hs8dll3CjUMdlHtVy7wU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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