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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d581399d46c63ef849f481aa87235debac240657db2e3abe675d5c81b34d6c0' 
  AND token = 'zFsm74efVxG5KT2WgCu4hg2zJnDEdS3YBbF9SLxHTg0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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