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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7ee0293175d4133ad28709241bbac34654029a3d053986a2ddc248d7f55f5d4' 
  AND token = 've8Dcwv0mzk4WLGcX9igMMz1M7H96aHxrgyaeOydKJI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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