SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '293b83140d92c3264f49fcf8d660ec3e2eea74b8bf5948a0f2250f1cd90156f2' 
  AND token = 'JWYvKGMoaJpxJE1oPq9C/s/x7thCJPXJFRnSihYaup4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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