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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f69836ae79501e8cea59a5602313db1863e70cf4e2fceb935f9f082dadd9d782' 
  AND token = 'qEX8YhEga4jTNRuBUMWouay9AkLjpY4KC3TUK/PqhdU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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