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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2317f0a9bb42b5a66e693e13a411ec42acd85f9919f216de02eecb67e5479199' 
  AND token = 'SiarqYris7Z1d85mLkghXdEZoInBugYpRMcGFijKx70=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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