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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d212ce83757f46821c0c57fb9aa5fe657270b42679a76f970618893fe759c6f' 
  AND token = '4PjoYijMJMAtztq7jZLXsO6ee00vN1yXdlU1GFdm/5c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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