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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bdee4d2877af662fd89399b234dbf4a33ee75ff327d9b50a13545e6d589ab2e8' 
  AND token = '0putIcn62Bk/DCmqnbu7RsTAYC54R845RuZ//yAgn/A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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