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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4fd57aa7cca37f71342fb3c6f26fa08a09fce1a29a62de877d4efc4d505acd52' 
  AND token = 'VrmAPnrpnpBOnbovQUW1X72yke+eh7yA5Ztl36tIjMY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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