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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '020aa90df48581451d984007ba817fdbf025a1f52f2aff7a5d6046d6e01c2bab' 
  AND token = 'wIJa2WijWQiCg4BHDV300Y5vGg0aaG5LKhHP6I3xwW0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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