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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1d2b9d9ecd5c4e2ea87bf1ed587dd1ec14028a32409b070a2604d4603beb8c8' 
  AND token = 'olHOApRxIfmhykGleYQMdkTZ+o0uszDGo9IfMLmDYIg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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