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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '18a5414f548ed945bfd7de699b553d8faff2cf23b8f3481dcb5c7c1e941a8529' 
  AND token = 'flS+inH6MK/TlNrBeNcHs9ovxx69hqLaIGvBtFy0OhU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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