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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36eb855e9362c923342def3445028daf4b4ac54f8f7e9493720e0dc438932920' 
  AND token = 'O1yKZ7BM21bgt/FOZbPx/6eAB2smZHK2ziimvCHRX+8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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