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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '42b9592a44b5f732b58f1292fb41742bf839d7840ec6394a8088914bb403a6a2' 
  AND token = 'l+FotwPI6db/l0JXCznlgetjoyvoom/cnle0FGLewHc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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