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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '071aef76b59ae09c0232a65584606d75fe9c85f042bd13ebb4fb5a6e0daf5e11' 
  AND token = 'aAXMtgD4xKvKQJMtobIpvFe6fELROJucV5z+cZEsZRI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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