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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a134771743520a9322f08e36b328d54813c8351aa65df7eb7366a642ca853ac7' 
  AND token = '2j8lamGl7iM3PXAiv67hV14X021KEOg8Ow3zTkSpIpc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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