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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4e2c32ebd60a4e155011bec7774fd9b0fc8c562f37b4ef94c27f965f3b630ad' 
  AND token = 'WXxd6HJ311q5X+N+7SLd0Kmifcpp01S3eeFsjIxBv4w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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