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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd871d7d817823e5841a99940481b602c3f5ba4ad4c022a7c2ea5f8fa1013e491' 
  AND token = 'rfAZDWJ0llfUo0bnWqWhOhrClBtGKH7V92Ft9fT5cXA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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