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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44d5fc755c46d4dd108579b3382388f0c3a634cf1f2eee48a0968a2a3401a43a' 
  AND token = 'aLf4VzY5N2OkhAXzZEz0L0WQo9djV9wey0HB2lbunqc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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