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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9dbee73d3bcda9f958155efcd90d5ce7d29de092b863dac2981517196076045' 
  AND token = 'XTRVEa0RmWDmDlxVDQGTDmJTFmSAG4nT2heJaH/Txwc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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