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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e8f136b2110463aba051360c9d8dee46b04f67f1b8e8c543cc34088cbd5559d' 
  AND token = 'jocsBWClR52ZjOhEIsfO5/rJi1NrJGVfLNZPaw+mdGo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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