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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30795596b778e5a0cdd1d228ca54062c282e718c656f780cf74bb33b0cfedcd9' 
  AND token = 'SLXoQWSH9yfOC1r9HjgWIUSM1QWRUozFlAZZAa5rqy8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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