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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ebd5d004b36881b44530bacf84499e346b98ae4eb9cfc294cc6fd80e1c4a40d' 
  AND token = 'zo4If77DqpiPIiFw/ZziOV8d6CEZcCrL0fIITd6yR1M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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