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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee4ae3b35f7ef1142530ced79cebe3dde972da8fcc97745301c3b772a862cd62' 
  AND token = 'DkUVvzpDCPGc2qnuFB3xQz+Me/75yDiBcSTuQchtRUY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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