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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '652527f3c476b96ca95509e42611a663e36beaf61da496e663bf763593ab295e' 
  AND token = 'SxuB1TcJntPvqua48+DrocoNOstDW+65x9pTdVInMew=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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