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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ff521ef2b5b2efb2079142773caec10766b266a05a1cb56c2c5b6de6620d5ad' 
  AND token = 'snPANLymp0m1FAEj/WsthxWlnrG0kuUY4QWlydb980E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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