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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e76a9e503553ee3a3b7c0a3e2d6af04208bed13c15a211a10737e11576f3383' 
  AND token = 'QN/KMIh03voT8kh1RmRLtrQWuZB6Eja91lukNURur1E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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