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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c0e8da006bc60e887ac529447369c41c92cd96982b6a82bef8d46d3604ae92d' 
  AND token = 'dGSjhdv+EpzlSRo+thSr64uFcIWBvXtqXkMIThNes4A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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