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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '962731861614f7b01ed4e03167dbaeacb370b90284f0ba42e668a27003ba14a3' 
  AND token = 'uwBWPbTYJZqC5Cv7y+iXyNsigfwk967mMMhgW7J00us=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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