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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f18dcfc9cabbddec00f845b5bf5832d5e6591d8c72a1a4f8fbc815a85a85b827' 
  AND token = '1acUBkdNZlACoGUxe/emOeRCOfDuRjdzw2kvNcxCj2U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00062

JSON explain

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