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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71d73c75895506f1c77ce3ac843b6b88d1b15177024bc171e426e040aa4b7522' 
  AND token = 'zcToNo5js2Bw5dVTQo9s9HFakb0LxfcKEv5H8HVMQ7E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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