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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5975254adb82de49ceeaff8d4c88378bd805fc4952b5b7002b6db4b376452cf5' 
  AND token = '/mztlN38VwIgYKPiSd3lZBx9L29AHf9AodL8FKHWvcQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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