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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b98b0f4dcc0c25bbf1839399cce542dcdcff0a864c8d7a1390c76bae95d5494d' 
  AND token = 'YjV+DLeZwqid6Nck6oddnNenm0j3/FWghEDuLiBa57U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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