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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1930919b8b799c4826bec7043ce211593169cb7f1a6ac45234927f43b5f3e0b' 
  AND token = '0UarRdUHr/J0nKdZNK2RDSpas8oOqBDpUtSXnZpApwU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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